//sha1.h：对字符串进行sha1加密  
#ifndef _SHA1_H_  
#define _SHA1_H_  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
  
typedef struct SHA1Context{  
    unsigned Message_Digest[5];        
    unsigned Length_Low;               
    unsigned Length_High;              
    unsigned char Message_Block[64];   
    int Message_Block_Index;           
    int Computed;                      
    int Corrupted;                     
} SHA1Context;  
  
void SHA1Reset(SHA1Context *);  
int SHA1Result(SHA1Context *);  
void SHA1Input( SHA1Context *,const char *,unsigned);  
#endif  
  
  
#define SHA1CircularShift(bits,word) ((((word) << (bits)) & 0xFFFFFFFF) | ((word) >> (32-(bits))))  
  
void SHA1ProcessMessageBlock(SHA1Context *);  
void SHA1PadMessage(SHA1Context *);  
  
void SHA1Reset(SHA1Context *context){// 初始化动作  
    context->Length_Low             = 0;  
    context->Length_High            = 0;  
    context->Message_Block_Index    = 0;  
  
    context->Message_Digest[0]      = 0x67452301;  
    context->Message_Digest[1]      = 0xEFCDAB89;  
    context->Message_Digest[2]      = 0x98BADCFE;  
    context->Message_Digest[3]      = 0x10325476;  
    context->Message_Digest[4]      = 0xC3D2E1F0;  
  
    context->Computed   = 0;  
    context->Corrupted  = 0;  
}  
  
  
int SHA1Result(SHA1Context *context){// 成功返回1，失败返回0  
    if (context->Corrupted) {  
        return 0;  
    }  
    if (!context->Computed) {  
        SHA1PadMessage(context);  
        context->Computed = 1;  
    }  
    return 1;  
}  
  
  
void SHA1Input(SHA1Context *context,const char *message_array,unsigned length){  
    if (!length) return;  
  
    if (context->Computed || context->Corrupted){  
        context->Corrupted = 1;  
        return;  
    }  
  
    while(length-- && !context->Corrupted){  
        context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);  
  
        context->Length_Low += 8;  
  
        context->Length_Low &= 0xFFFFFFFF;  
        if (context->Length_Low == 0){  
            context->Length_High++;  
            context->Length_High &= 0xFFFFFFFF;  
            if (context->Length_High == 0) context->Corrupted = 1;  
        }  
  
        if (context->Message_Block_Index == 64){  
            SHA1ProcessMessageBlock(context);  
        }  
        message_array++;  
    }  
}  
  
void SHA1ProcessMessageBlock(SHA1Context *context){  
    const unsigned K[] = {0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6 };  
    int         t;                  
    unsigned    temp;               
    unsigned    W[80];              
    unsigned    A, B, C, D, E;      
  
    for(t = 0; t < 16; t++) {  
    W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;  
    W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;  
    W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;  
    W[t] |= ((unsigned) context->Message_Block[t * 4 + 3]);  
    }  
      
    for(t = 16; t < 80; t++)  W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);  
  
    A = context->Message_Digest[0];  
    B = context->Message_Digest[1];  
    C = context->Message_Digest[2];  
    D = context->Message_Digest[3];  
    E = context->Message_Digest[4];  
  
    for(t = 0; t < 20; t++) {  
        temp =  SHA1CircularShift(5,A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0];  
        temp &= 0xFFFFFFFF;  
        E = D;  
        D = C;  
        C = SHA1CircularShift(30,B);  
        B = A;  
        A = temp;  
    }  
    for(t = 20; t < 40; t++) {  
        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];  
        temp &= 0xFFFFFFFF;  
        E = D;  
        D = C;  
        C = SHA1CircularShift(30,B);  
        B = A;  
        A = temp;  
    }  
    for(t = 40; t < 60; t++) {  
        temp = SHA1CircularShift(5,A) + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];  
        temp &= 0xFFFFFFFF;  
        E = D;  
        D = C;  
        C = SHA1CircularShift(30,B);  
        B = A;  
        A = temp;  
    }  
    for(t = 60; t < 80; t++) {  
        temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];  
        temp &= 0xFFFFFFFF;  
        E = D;  
        D = C;  
        C = SHA1CircularShift(30,B);  
        B = A;  
        A = temp;  
    }  
    context->Message_Digest[0] = (context->Message_Digest[0] + A) & 0xFFFFFFFF;  
    context->Message_Digest[1] = (context->Message_Digest[1] + B) & 0xFFFFFFFF;  
    context->Message_Digest[2] = (context->Message_Digest[2] + C) & 0xFFFFFFFF;  
    context->Message_Digest[3] = (context->Message_Digest[3] + D) & 0xFFFFFFFF;  
    context->Message_Digest[4] = (context->Message_Digest[4] + E) & 0xFFFFFFFF;  
    context->Message_Block_Index = 0;  
}  
  
void SHA1PadMessage(SHA1Context *context){  
    if (context->Message_Block_Index > 55) {  
        context->Message_Block[context->Message_Block_Index++] = 0x80;  
        while(context->Message_Block_Index < 64)  context->Message_Block[context->Message_Block_Index++] = 0;  
        SHA1ProcessMessageBlock(context);  
        while(context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;  
    } else {  
        context->Message_Block[context->Message_Block_Index++] = 0x80;  
        while(context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;  
    }  
    context->Message_Block[56] = (context->Length_High >> 24 ) & 0xFF;  
    context->Message_Block[57] = (context->Length_High >> 16 ) & 0xFF;  
    context->Message_Block[58] = (context->Length_High >> 8 ) & 0xFF;  
    context->Message_Block[59] = (context->Length_High) & 0xFF;  
    context->Message_Block[60] = (context->Length_Low >> 24 ) & 0xFF;  
    context->Message_Block[61] = (context->Length_Low >> 16 ) & 0xFF;  
    context->Message_Block[62] = (context->Length_Low >> 8 ) & 0xFF;  
    context->Message_Block[63] = (context->Length_Low) & 0xFF;  
  
    SHA1ProcessMessageBlock(context);  
}  
  
/* 
int sha1_hash(const char *source, char *lrvar){// Main 
    SHA1Context sha; 
    char buf[128]; 
 
    SHA1Reset(&sha); 
    SHA1Input(&sha, source, strlen(source)); 
 
    if (!SHA1Result(&sha)){ 
        printf("SHA1 ERROR: Could not compute message digest"); 
        return -1; 
    } else { 
        memset(buf,0,sizeof(buf)); 
        sprintf(buf, "%08X%08X%08X%08X%08X", sha.Message_Digest[0],sha.Message_Digest[1], 
        sha.Message_Digest[2],sha.Message_Digest[3],sha.Message_Digest[4]); 
        //lr_save_string(buf, lrvar); 
         
        return strlen(buf); 
    } 
} 
*/  
  
char * sha1_hash(const char *source){// Main  
    SHA1Context sha;  
    char *buf;//[128];  
  
    SHA1Reset(&sha);  
    SHA1Input(&sha, source, strlen(source));  
  
    if (!SHA1Result(&sha)){  
        printf("SHA1 ERROR: Could not compute message digest");  
        return NULL;  
    } else {  
      buf=(char *)malloc(128);  
        memset(buf,0,sizeof(buf));  
        sprintf(buf, "%08X%08X%08X%08X%08X", sha.Message_Digest[0],sha.Message_Digest[1],  
        sha.Message_Digest[2],sha.Message_Digest[3],sha.Message_Digest[4]);  
        //lr_save_string(buf, lrvar);  
          
        //return strlen(buf);  
        return buf;  
    }  
}  